Hi, I'm new here too, and can understand what you mean about the magnesium. It burns and made me violently sick every time they pushed through a large dose quickly (in my case after each seizure.)
My BP never went what most people would call high, but it was for me (mine's normally in my boots it's so low.)
It's never gone back to what it was, stayed at most people call normall, but my GP wants to check it every 6m, along with a cholestrol test.
Apparently we are now more at risk of long term BP and heart problems after having PE, so it would make sense to have a bi-anual check with your doc as mine's recommended.
It's still early days for you, it will get better, although I honestly felt like I'd been hit by a train for the first few months. I was just in a blur, mind and body and emotions not working properly.